anyone else running these springs on their 06-11? i'm in the process of lowering my coupe and ordered from tousley. they sent me the ZXM1 springs as opposed to the ZX3B springs that i've read most people on here run. does anyone know whats different about these springs from the ZX3Bs? i've searched on here and i did find a thread about this same topic but didn't want to revival an old thread & it didn't answer my question much. i've read some users on here say that the ZXM1's are stiffer and are more dialed in for track use rather than street use like the ZX3B. whether this is true or not i don't know, but i've decided to hold off on getting the dampers until i can clear this up. i'd rather have a street suspension than a suspension ready for the track. this car won't be tracked at all much really. so yeah are there any differences i should know about? should i send these back & look for the ZX3B kit? are these newer & updated versions of the ZX3B? please do help me out here... =)

M-5560-zxm1's are said to be a progressive spring, so ultimately they will be more stiff than the zx3b's. FRPP also lists that they should be paired with the ZXM1/dynamic damper kit. I have had the zx3b's and my biggest complaint was they were too soft. I dont think there would be a problem daily driving the zxm1's but that is my opinion and its your car

I heard a few people say the zx3b's were too soft... I've only had mine of for about 300 miles, ride wise it feels a lot like the stockers only with less body roll and more sure footed around fast corners, but only very slightly more firm... Just curious why they felt soft to you?

The mechanical database says "Progressive Spring
Is when there is a variable rate increase throughout the spring's working range."

So would that mean they would begin to feel stiffer the as more of the available travel is used? Or would it mean it reacts differently depending on the kind of force that it meets? Ie: react to one kind of force but firm up to another- like a MTB suspension.

EDIT: so is that why its said the the zxm1's would feel so much firmer without actually having a much greater spring rate?

Progressive springs are soft for the first bit of suspension travel vs specific springs that have the same spring rate thru out the suspension travel. You can see the spring coils on progressive are closer on one end vs the same coil spacing on specfic rate springs.

Progressive springs are soft for the first bit of suspension travel vs specific springs that have the same spring rate thru out the suspension travel. You can see the spring coils on progressive are closer on one end vs the same coil spacing on specfic rate springs.

Oh okay! Would that first bit of softness still be there w/ the vehicle weight compressing them?

I heard a few people say the zx3b's were too soft... I've only had mine of for about 300 miles, ride wise it feels a lot like the stockers only with less body roll and more sure footed around fast corners, but only very slightly more firm... Just curious why they felt soft to you?

Dont get me wrong, they are an improvement over stock and work well for daily use

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